Basicaly energy purchace packs that are based off of your tier. Say you reach tier two, you can now buy a tier two pack. The starter pack kinda works as a tier 1 pack.
Each 20$ pack contains;
A sheild.
An armor part.
A weapon.
A weapon slot.
7,500 energy.
A promo accesory that alters with each pack, and can be placed on the armor part recived.
Each can be bought only once, and this would kill the starter pack. Totaly changeable if it seems like too much or too little or if it should be more like the starter pack. Each weapon would start at the lower star level of the tier, with the exeption of teir 1 (since you start with 0* items), with armor rates going from 1*, 2*, then 4*. These weapons would be able to be upgraded enough to reach the next tier as well.
You wouldn't get things like sword armor and sheilding with a bomb, or full fire weakness items in T3 that would be essentialy useless for starters, or anything you already have.
*Tier.